ketamine is bought (read stolen) as viles, then you pour in onto a pan, 4 parts water, 1 part ketamine then leave it either by itself in the sun (if you have the time) or on low flame till it has all evaporated.
You will be left with white flakes which you then gather up and cut into a fine white powder. You can bump it (wrap it up in tallyho papers then twist the end like a "bomb" sort of. Hard to explain) or you can snort it but onl in the tiniest lined because it is very strong.
I'm not sure about dosage levels, you will have to look it up. You can inject it but never mainlimne it. Only shoot it into your muscle, like an arm/shoulder muscle. You can just about be garenteed death if you mainline k. With that said, ive never tried it and I would love to get my hands on some!!
As for it being black... I personally wouldnt trust and i would chuck it out. Better to be safe than sorry. But perhaps it is just burnt. BUT... maybe its inactive if its burnt. hmmmm??
------------------
just say no to drugs.... and then ask yourself "why on earth are the drugs talking to me??"